Update dependency opn to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
opn	5.5.0 → 6.0.0

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Release Notes

sindresorhus/open (opn)

v6.0.0

Compare Source

Breaking:

• Rename the package from opn to open (See the readme for more info) eca88d8
• Make the wait option false by default da2d663
• Require Node.js 8 5c525b5

Enhancements:

• Add support for Windows apps referenced by their WSL paths (#​118) b30220c

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